Chemistry of inorganic compounds – Nitrogen or compound thereof
Patent
1992-12-22
1994-06-21
Langel, Wayne
Chemistry of inorganic compounds
Nitrogen or compound thereof
148230, 148238, C01B 2104
Patent
active
053226763
ABSTRACT:
A process for producing low-cost furnace atmospheres suitable for annealing and heat treating ferrous and nonferrous metals and alloys, brazing metals and ceramics, sealing glass to metal, and sintering metal and ceramic powders in a continuous furnace equipped with an ammonia dissociator from non-cryogenically produced nitrogen containing from 0.05 to 5.0% residual oxygen is presented. The disclosed process involves mixing non-cryogenically produced nitrogen with a pre-determined amount of a reducing gas such as hydrogen, ammonia, a C, H, and O containing hydrocarbon such as an alcohol, an ether, etc., or a mixture thereof, passing the mixture through an ammonia dissociator and converting the residual oxygen to an acceptable form such as moisture, carbon monoxide, carbon dioxide, or mixture thereof, and using the resultant gaseous mixture for annealing and heat treating ferrous and nonferrous metals and alloys, brazing metals and ceramics, sealing glass to metal, and sintering metal and ceramic powders.
REFERENCES:
patent: 3379507 (1968-04-01), Becker et al.
patent: 3598538 (1971-08-01), Peacock
patent: 4179407 (1979-12-01), Iiyama
patent: 4605579 (1990-10-01), Campbell
patent: 4704267 (1987-11-01), Dimartino
P. Murzyn & L. Flores, Jr., Carburizing with Membrane N.sub.2 : process and quality issues, Mar. 1988, pp. 28-32.
H. Walton, New Method of Generating Nitrogen for Controlled Atmosphere Heat Treatment at Torrington Shiloh Plant, Mar. 1986 pp. 40-46.
P. F. Stratton, The Use of Non-Cryogenically Produced Nitrogen in Furnace Atmospheres, 1989, pp. 63-67.
D. J. Bowe & D. L. Fung, How PSA Nitrogen Works in a Heat Treating Shop, pp. 30-33, no date.
Air Products and Chemicals Inc.
Langel Wayne
Marsh William F.
Simmons James C.
LandOfFree
Process for producing furnace atmospheres using noncryogenically does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for producing furnace atmospheres using noncryogenically, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing furnace atmospheres using noncryogenically will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2219398